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JEE Main & Advanced Sample Paper JEE Main - Mock Test - 4

  • question_answer
    The energy absorbed by each molecule \[({{A}_{2}})\]of a substance is \[4.4\times {{10}^{-19}}J\]and bond energy per molecule is \[4.0\times {{10}^{-19}}J\]. The kinetic energy of the molecule per atom will be

    A) \[2.2\times {{10}^{-19}}J\]      

    B) \[2.0\times {{10}^{-19}}J\]

    C) \[4.0\times {{10}^{-20}}J\]      

    D) \[2.0\times {{10}^{-20}}J\]

    Correct Answer: D

    Solution :

    [d]: Energy absorbed by each molecule \[=4.4\times {{10}^{-19}}J\] Energy required to break the bond \[=4.0\times {{10}^{-19}}J\] Remaining energy gets converted to kinetic energy \[=(4.4\times {{10}^{-19}}-4.0\times {{10}^{-19}})J\] \[=0.4\times {{10}^{-19}}J\]per molecule \[\therefore \]Kinetic energy per atom \[=0.2\times {{10}^{-19}}J\]             \[=2\times {{10}^{-20}}J\]


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